What fruit has the highest acid level? The scientific truth about pH
                                
                                
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                                    5 min read                                
                            
                                With a pH level ranging from 2.0 to 2.6, lemon juice stands out as one of the most acidic common fruits. However, the title for what fruit has the highest acid level is a close competition that also includes limes and can even depend on whether the fruit is whole or processed.